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Jensen J, Lendorf A, Stimpel H, Frost J, Ibsen H, Rosenkilde P. The prevalence and etiology of impotence in 101 male hypertensive outpatients. Am J Hypertens 1999; 12:271-5. [PMID: 10192229 DOI: 10.1016/s0895-7061(98)00225-8] [Citation(s) in RCA: 120] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Erectile dysfunction and impotence has a high prevalence among male hypertensive patients. Whether this relates mainly to specific drug side effects or to primary pathogenic disorders is unknown. In the present study 101 male patients from our outpatient hypertension clinic answered detailed questionnaires about hypertension and sexual function. Patients with perceived impotence were offered a thorough penile evaluation and examination performed by specialists in the urology department. Twenty-seven (27%) men had impotence. The main cause of impotence was an arterial dysfunction (89%). The prevalence of impotence was related to the degree of secondary organ manifestation, reflected by World Health Organization (WHO) classification I-III (P = .01). Intermittent claudication (P = .001) and ischemic heart disease (P = .005) were the best determinants in this respect. Twelve impotent patients (44%) ascribed onset of impotence to drug initiation. A variety of drugs were incriminated in the occurrence of drug-induced impotence. In summary our results indicate that impotence in hypertensive men is caused mainly by penile arterial vascular changes, probably atherosclerosis. Drug-induced impotence could well be the result of blood pressure reduction itself and not specific drug side effects.
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Paisey RB, Harvey P, Rice S, Belka I, Bower L, Dunn M, Taylor P, Paisey RM, Frost J, Ash I. An intensive weight loss programme in established type 2 diabetes and controls: effects on weight and atherosclerosis risk factors at 1 year. Diabet Med 1998; 15:73-9. [PMID: 9472867 DOI: 10.1002/(sici)1096-9136(199801)15:1<73::aid-dia516>3.0.co;2-f] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The efficacy, safety, and effect on cardiovascular risk factors of two intensive weight loss programmes in overweight Type 2 diabetic subjects were studied. The patients were recruited from hospital diabetic clinics and control obese subjects from the community. Obese (BMI >30) patients with Type 2 diabetes mellitus and controls were offered intensive conventional diabetic advice or a very low calorie diet. Weekly 2 h sessions were conducted in two day-room areas of adjacent medical wards of Torbay Hospital. Non-diabetic and diabetic very low calorie diet groups reduced BMI by 6 and 5 kg m(-2), respectively, at 1 year. Waist-hip ratios (-0.06 and -0.05) were also reduced (p = 0.04 and p = 0.01), while HDL/total cholesterol ratios increased (+0.04 and +0.06, p = <0.01). Transient changes in blood pressure and antioxidant vitamin status occurred in the intensive conventional diet group. Fourteen of diabetic very low calorie diet subjects discontinued insulin and oral hypoglycaemic agents for the whole year, and psychological well-being transiently improved. Substantial weight loss and improvement in cardiovascular risk factors could be maintained for 1 year in Type 2 diabetic patients by the use of a very low calorie diet.
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Gilbreth M, Yang P, Wang D, Frost J, Polverino A, Cobb MH, Marcus S. The highly conserved skb1 gene encodes a protein that interacts with Shk1, a fission yeast Ste20/PAK homolog. Proc Natl Acad Sci U S A 1996; 93:13802-7. [PMID: 8943016 PMCID: PMC19432 DOI: 10.1073/pnas.93.24.13802] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/1996] [Accepted: 09/17/1996] [Indexed: 02/03/2023] Open
Abstract
The Shk1 protein kinase, a homolog of Saccharomyces cerevisiae Ste20 and mammalian p21Cdc42/Rac-activated kinases, is an essential component of a Ras- and Cdc42-dependent signaling cascade required for cell viability, normal morphology, and mitogen-activated protein kinase-mediated sexual responses in the fission yeast, Schizosaccharomyces pombe. To identify S. pombe proteins that modulate or mediate Shk1 functions, we conducted a two-hybrid screen for Shk1-interacting proteins. One of the genes identified as a result of this screen was skb1. We show that Skb1 interacts with a region of the N-terminal regulatory domain of Shk1 distinct from that to which Cdc42 binds, and that Shk1, Cdc42, and Skb1 are able to form a ternary complex in vivo. S.pombe cells carrying an skb1 null mutation are less elongate in morphology than wild-type cells and exhibit a moderate growth defect. The morphology defect of the skb1 deletion mutant is suppressed by overexpression of Shk1. Overexpression of Skb1 causes wild-type S. pombe cells to become hyperelongated. Additional genetic analyses described herein suggest that Skb1 is a component of the morphology control branch of the Ras signaling cascade in S. pombe and that it positively modulates Shk1 function. Homologs of Skb1 are encoded by open reading frames in the genomes of S. cerevisiae and Caenorhabditis elegans and by an uncharacterized human cDNA sequence. Thus, skb1 may be the first well-characterized member of a highly conserved family of genes encoding potential p21Cdc42/Rac-activated kinase regulators.
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Miskowiak J, Frost J. [Blood loss during transurethral resection of the prostate]. Ugeskr Laeger 1996; 158:3924-7. [PMID: 8701507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Measurement of the perioperative blood loss during transurethral resection of the prostate was performed using the modern HemoCue photometer in 100 men. The measurement lasts only 5-10 minutes. The median weight of the removed prostate was 28 grams and the operating time 60 minutes. The median blood loss was 393 ml (range 8-1843 ml) and was positively correlated to operating time, change in the peroperative blood pressure, volume of the irrigating fluid and the drop in the postoperative serum sodium. Perioperative measurements of the blood loss draw the surgeons' attention to the haemostasis, provide an objective measure of the most important factor for morbidity during TURP and allow a rational policy for blood transfusion. It is an advantage to place this measurement in the hands of professionals, i.e. laboratory technicians, who are trained to quality-secure the measurement and preserve the photometer.
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Lardenois P, Frost J, Dargazanli G, George P. A Convenient Synthesis 7,8-Dihydroisoquinolin-5( 6H)-One. SYNTHETIC COMMUN 1996. [DOI: 10.1080/00397919608004541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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56
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Avenet P, Léonardon J, Besnard F, Graham D, Frost J, Depoortere H, Langer SZ, Scatton B. Antagonist properties of the stereoisomers of ifenprodil at NR1A/NR2A and NR1A/NR2B subtypes of the NMDA receptor expressed in Xenopus oocytes. Eur J Pharmacol 1996; 296:209-13. [PMID: 8838458 DOI: 10.1016/0014-2999(95)00700-8] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The NMDA receptor antagonist ifenprodil contains two asymmetric centres which give rise to four stereoisomeric forms of this molecule. The inhibitory effects of each of these stereoisomers on recombinant NMDA receptors expressed from NR1A/NR2A and NR1A/NR2B subunit combinations were studied in Xenopus oocytes by voltage-clamp recording. All four ifenprodil stereoisomers were potent antagonists at NR1A/NR2B (IC50 < 0.8 microM), but weak antagonists at NR1A/NR2A receptors (IC50 > 100 microM). In heteromeric NR1A/NR2B receptors, (+) erythro- and (-) threo-ifenprodil (IC50 0.21 and 0.22 microM, respectively) were about 4 times more potent than (-) erythro- and (+) threo-ifenprodil (IC50 0.81 and 0.76, respectively). These results show that the stereoisomers of ifenprodil exhibit a weak though significant stereoselectivity at the NR1A/NR2B NMDA receptor subtype.
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Polverino A, Frost J, Yang P, Hutchison M, Neiman AM, Cobb MH, Marcus S. Activation of mitogen-activated protein kinase cascades by p21-activated protein kinases in cell-free extracts of Xenopus oocytes. J Biol Chem 1995; 270:26067-70. [PMID: 7592806 DOI: 10.1074/jbc.270.44.26067] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
In the evolutionarily distant yeasts Saccharomyces cerevisiae and Schizosaccharomyces pombe, genetic evidence suggests that activation of pheromone-induced mitogen-activated protein kinase (MAPK) cascades involves the function of the p21cdc42/racl-activated protein kinases (PAKs) Ste20 and Shk1, respectively. In this report, we show that purified Ste20 and Shk1 were each capable of inducing p42MAPK activation in cell-free extracts of Xenopus laevis oocytes, while a mammalian Ste20/Shk1-related protein kinase, p65pak (Pak1), did not induce activation of p42MAPK. In contrast to p42MAPK, activation of JNK/SAPK in Xenopus oocyte extracts was induced by both the yeast Ste20 and Shk1 kinases, as well as by mammalian Pak1. Our results demonstrate that MAPK cascades that are responsive to PAKs are conserved in higher eukaryotes and suggest that distinct PAKs may regulate distinct MAPK modules.
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Paisey RB, Harvey P, Rice S, Belka I, Bower L, Dunn M, Paisey RM, Frost J, Goldman P, Ash I. Short-term results of an open trial of very low calorie diet or intensive conventional diet in Type 2 diabetes. ACTA ACUST UNITED AC 1995. [DOI: 10.1002/pdi.1960120611] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Xu S, Robbins D, Frost J, Dang A, Lange-Carter C, Cobb MH. MEKK1 phosphorylates MEK1 and MEK2 but does not cause activation of mitogen-activated protein kinase. Proc Natl Acad Sci U S A 1995; 92:6808-12. [PMID: 7624324 PMCID: PMC41418 DOI: 10.1073/pnas.92.15.6808] [Citation(s) in RCA: 132] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
A constitutively active fragment of rat MEK kinase 1 (MEKK1) consisting of only its catalytic domain (MEKK-C) expressed in bacteria quantitatively activates recombinant mitogen-activated protein (MAP) kinase/extracellular signal-regulated protein kinase (ERK) kinases 1 and 2 (MEK1 and MEK2) in vitro. Activation of MEK1 by MEKK-C is accompanied by phosphorylation of S218 and S222, which are also phosphorylated by the protein kinases c-Mos and Raf-1. MEKK1 has been implicated in regulation of a parallel but distinct cascade that leads to phosphorylation of N-terminal sites on c-Jun; thus, its role in the MAP kinase pathway has been questioned. However, in addition to its capacity to phosphorylate MEK1 in vitro, MEKK-C interacts with MEK1 in the two-hybrid system, and expression of mouse MEKK1 or MEKK-C in mammalian cells causes constitutive activation of both MEK1 and MEK2. Neither cotransfected nor endogenous ERK2 is highly activated by MEKK1 compared to its stimulation by epidermal growth factor in spite of significant activation of endogenous MEK. Thus, other as yet undefined mechanisms may be involved in determining information flow through the MAP kinase and related pathways.
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Hirschberger J, Hartmann K, Wilhelm N, Frost J, Lutz H, Kraft W. [Clinical symptoms and diagnosis of feline infectious peritonitis]. TIERARZTLICHE PRAXIS 1995; 23:92-9. [PMID: 7792783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Body effusions from 197 cats and blood serum samples from 252 cats, where Feline Infectious Peritonitis (FIP) was part of the differential diagnosis, were analysed. The diagnoses were confirmed by clinical follow up or histopathology. The final diagnosis FIP was always confirmed by histopathology. The median age of cats with FIP was 1.6 years. FIP was responsible for 41% of the body effusions, whereas malignomas caused 24%, cardial insufficiencies 14% and purulent serositis 12% of the body effusions. The rivalta test was highly sensitive for FIP. Predictive value of a negative result was 100%, predictive value of a positive result was 84%. In half of the cases with purulent serositis and in 20% of malignomas rivalta reacted positive. The cardial insufficiencies were negative for rivalta. Coronavirus antigen could be demonstrated by immunofluorescence in 34 of 49 body effusions caused by FIP, whereas in the 50 body effusions caused by other diseases no coronavirus antigen was detected. An albumin globulin ratio of < 0.6 was highly diagnostic for an inflammatory process, nearly exclusively for FIP. An albumin globulin ratio of > or = 0.8 almost excluded FIP. Only a negative or very high (1:1600) FIP titer could contribute to confirm diagnosis. Low and medium titers, however, should not be interpreted.
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Frost J. Effects of an advanced surgical nursing module on clinical practice. PROFESSIONAL NURSE (LONDON, ENGLAND) 1994; 9:439-40, 442. [PMID: 7513891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
1. Innovation and changes in practice can be developed through continuing education. 2. By adapting appropriate change strategies, theories learned in class can be applied in practice. 3. Excellence in quality can be achieved by all qualified nurses by applying theory to practice.
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Frost J. Complementary treatments for eczema in children. PROFESSIONAL NURSE (LONDON, ENGLAND) 1994; 9:330-2. [PMID: 8140108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
1. Complementary therapies are just that and not an alternative to routine therapies. 2. The growing use of complementary therapies for eczema reflects a renewed interest in self-medication and a declining belief in orthodox medicine. 3. Prior to using essential oils, nurses should check for sensitivity to certain oils. 4. Herbalism offers a number of approaches to the treatment of eczema.
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Cobb MH, Xu S, Hepler JE, Hutchison M, Frost J, Robbins DJ. Regulation of the MAP kinase cascade. CELLULAR & MOLECULAR BIOLOGY RESEARCH 1994; 40:253-256. [PMID: 7874203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The MAP kinase cascade is regulated by many hormones and growth factors and its activation leads to changes in properties of cytoplasmic, membrane-associated, and nuclear proteins. The MAP kinases themselves are activated by MEKS. MEKs lie at a point of convergence for multiple upstream signals, mediated by distinct protein kinases, Raf, MEK kinase, and Mos, all of which have MEK kinase activity. Additional inputs that stimulate the MAP kinase pathway are the activation of protein kinase C and the yeast protein kinase STE20. Mechanisms of regulation of some of the upstream components of this cascade have not yet been fully elucidated.
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Scatton B, Giroux C, Thenot J, Frost J, George P, Carter C, Benavides J. Eliprodil Hydrochloride < Rec INNM >. DRUG FUTURE 1994. [DOI: 10.1358/dof.1994.019.10.264852] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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66
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Frost J. Folic acid: consider the evidence. MCN Am J Matern Child Nurs 1993; 18:302, 304. [PMID: 8295515 DOI: 10.1097/00005721-199311000-00004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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67
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Cheasty T, Rowe B, Said B, Frost J. Vibrio cholerae serogroup 0139 in England and Wales. BMJ (CLINICAL RESEARCH ED.) 1993; 307:1007. [PMID: 8241890 PMCID: PMC1679184 DOI: 10.1136/bmj.307.6910.1007-a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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68
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Rabenau H, Ohlinger V, Anderson J, Selb B, Cinatl J, Wolf W, Frost J, Mellor P, Doerr HW. Contamination of genetically engineered CHO-cells by epizootic haemorrhagic disease virus (EHDV). Biologicals 1993; 21:207-14. [PMID: 8117434 DOI: 10.1006/biol.1993.1077] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The characterization of a contaminating virus which was detected in genetically-engineered Chinese hamster ovary (CHO) cells during the production of biologicals is described in the present paper. Under electron microscopy, the contaminating virus had a morphology resembling that of an orbivirus. The relationship was confirmed by nucleic acid analysis which showed a RNA segment pattern characteristic of orbiviruses. With an immunoperoxidase staining of monolayer cells and through sero-neutralization tests the virus was identified as being identical to Epizootic Haemorrhagic Disease Virus (EHDV), isolate 318 (untyped) from Bahrain. Potential sources of the contaminating virus and feasible procedures to avoid adventitous virus infections in cell cultures are discussed.
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69
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Gold RB, Singh S, Frost J. The Medicaid eligibility expansions for pregnant women: evaluating the strength of state implementation efforts. FAMILY PLANNING PERSPECTIVES 1993; 25:196-207. [PMID: 8262168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Surveys of state Medicaid agencies and maternal and child health programs were conducted in late 1991 and in 1992 to evaluate the extent to which states carried out a series of federal policy changes intended to improve low-income women's access to prenatal care. The results show a great deal of variability in the aggressiveness with which states implemented these Medicaid eligibility expansions. Overall, North Carolina, Maryland, Massachusetts, New York and Arkansas moved most aggressively to carry out the expansions; Kansas, Nebraska, South Dakota, North Dakota and Wyoming were ranked least aggressive. States with relatively high levels of poor birth outcomes or low-birth-weight deliveries prior to the Medicaid expansions were generally more likely than other states to have undertaken reforms intended to increase the number of women eligible for assistance and ease their enrollment. In addition, expansion efforts were greater in states where the federal government paid more of the cost of caring for Medicaid recipients.
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Dykman MI, Lea MJ, Fozooni P, Frost J. Magnetoresistance in 2D electrons on liquid helium: Many-electron versus single-electron kinetics. PHYSICAL REVIEW LETTERS 1993; 70:3975-3978. [PMID: 10054013 DOI: 10.1103/physrevlett.70.3975] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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71
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Meeropol E, Leger R, Frost J. Latex allergy in patients with myelodysplasia and in health care providers: a double jeopardy. UROLOGIC NURSING 1993; 13:34-44. [PMID: 8327907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Latex-associated allergic reactions have been increasingly reported since first recognized as a potential problem. Allergic reactions are discussed, nonlatex products suggested, and preventative efforts outlined.
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Phillips S, Frost J. A barrier to continuity of care. Effects of the drug tariff on wound care in the community. PROFESSIONAL NURSE (LONDON, ENGLAND) 1993; 8:536-42. [PMID: 8483962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
In light of the recent implementation of the Community Care Act, it is paradoxical that many products and dressings needed by community nurses are not available to them. This causes particular problems for patients discharged from hospital requiring continuity of wound care. What can be done to improve community nurses' access to the full range of products?
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Guidera KJ, Smith S, Raney E, Frost J, Pugh L, Griner D, Ogden JA. Use of the reciprocating gait orthosis in myelodysplasia. J Pediatr Orthop 1993; 13:341-8. [PMID: 8496369 DOI: 10.1097/01241398-199305000-00013] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
There are advantages to an upright posture and ambulation in pediatric myelodysplasia patients. The reciprocating gait orthosis (RGO) is a useful tool to enable this activity in selected individuals. We evaluated the long-term usage, pitfalls, and contraindications of this orthosis. Mean daily usage was 6.9 h/day, requiring an average of 10 min to don or doff; all patients required assistance. Obesity, advanced age, lack of patient or family motivation, scoliosis, and spasticity were significant negative factors in long-term usage of the RGO. Good upper extremity strength, trunk balance, previous standing or walking, and active hip flexion were important positive variables. Eleven of 21 patients did not persist with long-term usage of this orthosis, averaging 25.8 months of usage. An energy study was performed on three patients, comparing the efficiency of reciprocating gait and swing-through gait. All three were more energy efficient and two were faster with the swing-through gait but each preferred the reciprocating pattern. Care should be taken when selecting patients for RGO usage because not all children with myelomeningocele are able to function effectively with this orthosis.
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Snir E, Nili M, Caspi A, Konichevsky S, Geva D, Shilo Y, Frost J, Vidne BA. [Cardiac surgery in a satellite unit--a possibility?]. HAREFUAH 1993; 124:520-1. [PMID: 8335283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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75
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Frost J. Clinical application of lasers. PROFESSIONAL NURSE (LONDON, ENGLAND) 1993; 8:298-303. [PMID: 8451249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The use of lasers is a rapidly expanding technological discipline. It has advantages for patients, but is not without potential hazards for practitioners and patients. Regular screening should be commonplace among practitioners. Adequate education for nurses working in regular contact with this technology should be seen as a priority.
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